Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b4e25eeb31c905…

MALICIOUS

PDF

94.5 KB Created: 2021-08-13 09:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 426d979febb0fe3ef627a243b20f8721 SHA-1: c98156f79e5482f9d900a6e459ef598449b7414c SHA-256: 51b4e25eeb31c905f3621dbb5a12676afd423c8f71f3d7389dd4fb0dab4b1540
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and numerous external links indicate it is likely used as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3ee297282---tomuv.pdf In PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/hfjuj4mdakju4d2hacvcgkf0hd/subexamo.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/gujonidojezebolo.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/90f5f36c63423eb90e88fc9e47c85660/nigepexaxulasar.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/momuzupo.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608076c699e94---48402122646.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d85ddd3c3a4---kexinuranadijifixofak.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/xumakikujexovo.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/zofuseku.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/99758311278.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/6a1nhcjc4dmacdhf5374k2s5e1/60437317525.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff685e74f9---monuvulejafigewu.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/divonigifemegival.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/limumaropudukivazed.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/75235848894.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ef46cd863---87884965504.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/wofobuvamugodad.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/pavelenofuzosasoviliged.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/bunuxupediwaser.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/sirosixobolegu.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f7374a5f3bf6506cc731bc2189c934bc/81761309945.pdfIn PDF document text
    • https://wineart.online/userfiles/file/dabugifomaro.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/85045794261.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/0988784d6c19d47ff3d013b3b04aab49/79871149805.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/03e42045ece0cd0853894c80da1a29e9/37457212560.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a708b425b---pazesizasiwiraziruji.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/tuzadetarezeger.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccc702f6b3---93962505099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=can+you+cook+gammon+on+a+george+foreman+grillPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B90 10748 bytes
SHA-256: 7f636a5618d3c37eb3a1e994430e974f0c79a947cbf0d1061a0115b5c89b6d69
font_01_sfnt_off00012446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12446 17788 bytes
SHA-256: db5178fda20a108487f0a91c924a0b1274364a714a712fef8b2de90ffdba7fb8
font_02_sfnt_off00015281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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